// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#pragma once

#include <string>

// Encodes the input string in base64.
void Base64Encode(const std::string &input, std::string *output);

// Decodes the base64 input string.  Returns true if successful and false
// otherwise. The output string is only modified if successful. The decoding can
// be done in-place.
bool Base64Decode(const std::string &input, std::string *output);

enum class Base64UrlEncodePolicy {
    // Include the trailing padding in the output, when necessary.
    INCLUDE_PADDING,

    // Remove the trailing padding from the output.
    OMIT_PADDING
};

// Encodes the |input| string in base64url, defined in RFC 4648:
// https://tools.ietf.org/html/rfc4648#section-5
//
// The |policy| defines whether padding should be included or omitted from the
// encoded |*output|. |input| and |*output| may reference the same storage.
void Base64UrlEncode(const std::string &input, Base64UrlEncodePolicy policy, std::string *output);

enum class Base64UrlDecodePolicy {
    // Require inputs contain trailing padding if non-aligned.
    REQUIRE_PADDING,

    // Accept inputs regardless of whether or not they have the correct padding.
    IGNORE_PADDING,

    // Reject inputs if they contain any trailing padding.
    DISALLOW_PADDING
};

// Decodes the |input| string in base64url, defined in RFC 4648:
// https://tools.ietf.org/html/rfc4648#section-5
//
// The |policy| defines whether padding will be required, ignored or disallowed
// altogether. |input| and |*output| may reference the same storage.
bool Base64UrlDecode(const std::string &input, Base64UrlDecodePolicy policy, std::string *output);
